Finding the Fourth Proportional to 85,875.60, 128,887.47 and 59,598.78

Step by Step Solution

1. Step 1: Write the proportion equation
   85,875.60 : 128,887.47 = 59,598.78 : x
2. Step 2: Convert to fraction form
   85,875.60/128,887.47 = 59,598.78/x
3. Step 3: Cross multiply
   85,875.60x = 128,887.47 × 59,598.78
4. Step 4: Simplify right side
   85,875.60x = 7,681,535,969.29
5. Step 5: Solve for x
   x = 7,681,535,969.29/85,875.60
6. Step 6: Final answer
   x = 89,449.58